Part of Google's blitz of announcements yesterday were several mobile announcements including a really neat feature named Google Goggles.
Google Goggles basically lets you snap pictures on your Android mobile device and Google will return search results based on that picture. It works best with landmarks, books, contact information, artwork, places, wines and logos. Here is a video on how it works:
Other announcements include Search by Voice in other languages, such as Japanese, English and Mandarin. Search by Location on Android, and Search by Sight which is Google Goggles.
Forum discussion at WebmasterWorld and Google Mobile Help.